This article is undergoing revision as part of Project: Planets, a collaborative effort to improve BattleTechWiki's coverage of planets and systems. If you would like to participate, please visit the project page, where you can add your name to the list of volunteers.

Lesalles was a former Sarna Supremacy world that remained under Capellan control for centuries until conquered by the Federated Suns during the Fourth Succession War. During Operation Guerrero in 3057, the world returned to the Capellan fold.

The jungles of Lesalles are renowned for the size of their trees where their average height is measured around 150 meters. It is in and within these jungles that the Lesallian Mailsloth is found.[26]

Following the speech given by First PrinceHanse Davion on the 16th of November 3029, the official day of thanks in the Federated Suns, contained a number of revelations including the creation of the St. Ives Compact and was taken by many as an open sign that the Fourth Succession War was close to ending.[27] The Armed Forces of the Federated Suns launched the Seventh Wave of Operation RAT shortly after, in a determined effort to secure as many systems as possible for an armistice was declared. The Seventh Wave capitalised on negotiations that had been conducted in secret between the Federated Suns and various planetary governments in the remnants of the Sarna Commonality who lacked defenses and were far more fearful of being annexed by the Free Worlds League, a state hated for centuries of raids and invasions, than they were the Federated Suns. In the last week of November the AFFS occupied thirteen systems, including Lesalles. The AFFS encountered little resistance, and relatively few troops were needed to provide a garrison to maintain calm.[14]